Process of dyeing and product thereof.



UNITED s ra ns earner curios.

RENE QTT, 0F ELBERFELD, GERJVKAIII, ASSIGNOR T0 FARBENFABMKEN WORM.

FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A CORPORATION OF @EBMANY.

PROCESS 0E DYEING AND PEtODUCT THEREOF.

No Drawing.

To all whom it ma concern:

Be it known that I, RENE Orr, chemist, citizen of the German Em ire,residing at Elberfeld, Germany, Kingdom of Prussia, have invented newand useful Improvements in Processes of Dyeing and Products Thereof, ofwhich the following is a specification.

I have made the surprising discovery that the diauthra uinonylaminobtainable by the action of 2-0 iloro-anthraqui'none onl-aminoanthraquinone can be used as a valuable vat dye. It yields withalkaline reducing agents a vat which dyes vegetable fiber an orangeshade of excellent fastness.

In order to illustrate my new process more fully the following exampleis given, the parts being by weight: Stir up 20 kilos of thedianthraquinonylamin (10 per cent. paste) with liters of warm water, addto this mixture 40 liters of a hydrosulfite solution 20 B. and 6 literscaustic soda lye 30 B. After a short time the color is completelydissolved. Prepare a dyebath which should contain 1800 to2000 andfinally soap. A very fast clear orange shade is thus obtained.

The printing is carried out in an analogous manner. The dye is e. g.printed on the fabric with tin crystals, copperas owder, tartar powderand tragacanth. fter printing, run through soda lye 18 Be. at

85 0., acidulate, rinse and soap at C.

Having now described my invention and in what manner the same is to beperformed,

Application filed January 6, 1909.

Specification of Letters Eatent. V Pafiggni'ggd J @113 14 @1919,

Serial No. 470,846.

what I claim as new and desire to secure by Letters Patent is 1.Theprocess of treating vegetable fiber. consistin in reacting on thehereinbefore defined ianthraquinonylamin with suitable reducing agentsto form a solution, ap lying the leuco compounds thus produced to thefiber and then oxidizing these leuco compounds, thus producing an orangesha e.

2. The process of treating ve etable fiber consisting in reacting on theereinbefore defined dianthraquinonylamin with alkaline hydrosulfites toform a solution, a plying the leuco compounds thus produce to the fiberand then oxidizing these leuco compounds, thus producing an. orangeshade.

3. The process of treating ve etable fiber consistin "1X1 reacting onthe defined tion, applying the leuco compounds thus produce to the fiberand then oxidizing these leuco compounds, thus producing an orangeshade.

4. As a new article of manufacture orange colored vegetable fiberimpregnated with the dxidation products of the leuco con1- pounds of thehereinbefore defined dianthraquinonylamin which treated fiber uponboiling with hydrochloric acid containing 10% of l-lCl remainspractically unchanged in color and upon treatment with sulfuric acid of90% changes from orange to darkbrown to black and which upon beingtouched with a watery solution containing 0.&% of anhydrous hydrosulfiteof sodium and 0.8% of caustic soda changes its color of orange toredbrown which on exposure to air again assumes its original color.

In testimony whereof- I have hereunto set my hand in the presence of twosubscribing witnesses.

RENE OTT. [1.. s.] Witnesses: I

Or'ro Kenn WALTER E. MILHAMP.

hereinbei ore ianthraquinonylamin with hydrosulfite and caustic soda lyeto form a solu-,

